Commit 6176a26d authored by Aurelien Jarno's avatar Aurelien Jarno
Browse files

target-ppc: optimize popcntb 



Suggested by Andrzej Zaborowski.

Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5592 c046a42c-6fe2-441c-8c8c-71466251a162
parent 182608d4

target-ppc/op_helper.c

+8 −14
Original line number Diff line number Diff line
@@ -222,25 +222,19 @@ target_ulong helper_srad (target_ulong value, target_ulong shift) 


target_ulong helper_popcntb (target_ulong val)

{

    uint32_t ret;

    int i;



    ret = 0;

    for (i = 0; i < 32; i += 8)

        ret |= ctpop8((val >> i) & 0xFF) << i;

    return ret;

    val = (val & 0x55555555) + ((val >>  1) & 0x55555555);

    val = (val & 0x33333333) + ((val >>  2) & 0x33333333);

    val = (val & 0x0f0f0f0f) + ((val >>  4) & 0x0f0f0f0f);

    return val;

}



#if defined(TARGET_PPC64)

target_ulong helper_popcntb_64 (target_ulong val)

{

    uint64_t ret;

    int i;



    ret = 0;

    for (i = 0; i < 64; i += 8)

        ret |= ctpop8((val >> i) & 0xFF) << i;

    return ret;

    val = (val & 0x5555555555555555ULL) + ((val >>  1) & 0x5555555555555555ULL);

    val = (val & 0x3333333333333333ULL) + ((val >>  2) & 0x3333333333333333ULL);

    val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >>  4) & 0x0f0f0f0f0f0f0f0fULL);

    return val;

}

#endif